Chemical Engineering MCQs

Page No. 432

The Fourier number (defined as a.t/L2) is used in the analysis of problem involving heat transfer by_______________?


aForced convection


bNatural convection


cTransient conduction


dSteady state conduction


View Answer Transient conduction

Three solid objects of the same material and of equal mass-a sphere, a cylinder (length = diameter) and a cube are at 500°C initially. These are dropped in a quenching bath containing a large volume of cooling oil each attaining the bath temperature eventually. The time required for 90% change in temperature is the smallest for_________________?


aCube


bCylinder


cSphere


dEqual for all the three


View Answer Cube

Which of the following forced convection heat transfer equation accounts for the liquid viscosity effect for viscous liquids ?


aDittus-Boelter equation


bSieder-Tate equation


cNusselt equation


dNone of these


View Answer Sieder-Tate equation

For condensation of pure vapors, if the heat transfer co-efficients in filmwise and drop-wise condensation are respectively hf and hd, then__________________?


ahf = hd


bhf > hd


chf < hd


dhf could be greater or smaller than hd


View Answer hf < hd

Heat transfer in the laminar sub-layer in case of a liquid flowing through a pipe, is mostly by__________________?


aEddies current


bConduction


cConvection


dNone of these


View Answer Conduction

_____________ heat exchanger is the most suitable, when the temperature of shell side fluid is much higher than that of tube side?


aSingle pass, fixed tube sheet


bU-tube


cThree pass, fixed tube sheet


dNone of these


View Answer U-tube

Evaporation of 1kg of water from a solution in a single effect evaporator requires about ________________ kg of steam?


a0.4 – 0.6


b1-1.3


c1.8-2


d2 – 2.4


View Answer 1-1.3

Thermal conductivities of most of the liquids _______________ with rise in temperature?


aIncreases


bDecreases


cRemains unchanged


dMay increase or decrease; depends on the liquid


View Answer Decreases

The purpose of providing a ‘catchall’ in the vapor line of an evaporator is to__________________?


aCreate vacuum


bRegulate the vapor flow


cVent the non-condensable gases


dArrest the entrained liquid



Removal of ______________ heat is involved in the condensation of a vapor under saturated conditions?


aSuper


bSensible


cLatent


dBoth B. & C.


View Answer Sensible

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